Mixer and beater



y 1945- M. POLCAR 2,374,831;

' MIXER AN-D' BEATER Filed July 15, 1943 Tronverse plane of stem r 2 Trq s\ erse glone of lc mflg 3' /s l Tronsverso plane of blades I v INVENTOR. I MARGUERITE POLCAR M KWMWQ L ATTORNEYS Patented May 1, 1945 UNITED srA'r MIXER AND BEATER Marguerite Polcar, Euclid, Ohio Application July 15, 1943, Serial -No.494,802

2Claims. oilets- 1 44) This invention relates to mixers and heaters; and it is among the objects of the invention to provide a construction which is particularly eflicient in action, and effective with large-or small amounts of material operated upon. Other objects and advantages will appear from the following description.

To the accomplishment of the foregoing and related ends, the invention, then, comprises the features hereinafter fully described, and particularly pointed out in the claims, the following description and the annexed drawing setting forth in detail certain illustrative embodiments of the invention, these being indicative however, of but a few of the various ways in which the principle of the invention may be employed.

In said annexed drawing:

Fig. 1 is a side elevational view of a device in accordance with the invention; Fig. 2 is a plan view of the same; Fig. 3 is a transverse sectional view taken on a plane indicated by line III-III, Fig. l, and schematized to show more clearly certain relationships of structural elements; Fig. 4 is a similar view, indicating structural relationships; and Fig. 5 is a similar view characteristic of prior art constructions.

The construction in general involves a stem portion H, and a working portion B with blades 2, 3, spaced apart'with an opening to between. A peculiarity is that the transverse plane of the blades is at a tilt or angle to the transverse plane of the stem, as will be more clearly understood by reference to Fig. 3 in connection with Fig. 1. Thus, the blades are in a relative position providing non-interfering faces of approach against the material operated upon. A sufiicient twist relative to the transverse plane of the stem, at a suitable point, for example along the region m, Fig. 1, with appropriate shaping of the blades, yields such contour arrangement. Considering the blades with relation to the longitudinal axis of the stem portion, the distance from such axis to the blade 2 is a shorter distance than that,

from the axial line to the blade 3, or in other words the blade 3 is oifset from the axial line of the stem a greater distance s than the distance r for the blade 2, as will be more clearly understood by reference to Fi 4.

If the blades have also a slight propeller-twist operating face, as is most usually preferable, the generation of waves giving thorough intermixture of the material operated upon is furthered.

Preferably, the distal ends of the blades}, 3 are joined by a connecting portion 5, although in some cases it may be omitted (as indotted lines in Fig. '2) with some resultant decrease in best efficiency; and thisconnecting portion usually may be of rounded outline, to better conform to the interior-of bowls in which the device may be used, and the outer edges of the blades desirably may have a sweep line curve for a similar reason.

As a further refinement, applicable in most cases, the connecting portion 5 has a facen inclined to the opening The action of this, as the device is moved through the material being treated, is 'to deflect material more effectively into the opening and the maelstrom being generated by the blades. And, in cases where desired, there may be a face at the base b of the blades, in the region m, Fig. 2, also inclined toward the opening to.

In operation, the device, grasped by the stem portion H as handle is revolved through the mass of material being beaten or mixed in a container or bowl, and the blades generate waves in the material, these being particularly emphasized by the peculiar angle of approach of the blades and the dilferential planes of action. This is in particular contract to spoon-like implements well known in the prior art, and in which a general spoon-shaped device has an opening in its bowl, and in which the transverse plane of the blades 2', 3', Fig. 5, is parallel to the transverse plane of the handle and if there are more than two blades, since they lie in the contour of the spoon bowl they are in a curved relation to each other In both cases they are instead of in a plane. equi-distant from the longitudinal axis line of the stem portion, instead of having one blade offset further than the other as in thepresent construction. In a spoon type of construction as in Fig. 5, in contrast to the present invention the blades cause such mutual interference inv generated waves as to bodily propel a large proportion of material rather than differentially generate waves to intermix; these respectively different types of structure leading to correspondingly difierent effects in actionbeing more clearly visualized by comparing Fig. 5 with Fi 3.

If the end of the stem portion be formed with straight sides, as in the dotted line form H in Fig. 2, it can be clamped in the sweep arm ofa motor. driven mixer to also be revolved through i the material to be operated upon, as in hand operation. The device of the present invention may be employed in mixing and beating materials of a wide range. of composition and consistencies, from beating of eggs to mixing of batters and doughs, and with the materials cold or hot. Illustrative of its notable effectiveness is the mixing up of starch or material in which starch'is a component. This is a material which in presence of heat tends to coagulate and lump so quickly that completely uniform mixing is ordinarily unobtainable, but with the present kind of construction the mixing action is so rapid that the starch is uniformly disseminated before portions of. it can lump togethen.

Qthey' modes of applying the principleofi the invention may be employed, change being made as regards the details described, provided the features stated in any of the following claims; or the eqivalent of such, be employe L 1 I therefore particularly point out and distinctly claim as my invention:

1. A mixing and beating: implement; of the character described, comprising a stem portion,

and a working portion which is transversely" slanted at an. to thetransverse: planeof the stem portion. and consisting of: two spaced being ofiset at a greater distance from the longiapart unsymmetrical blades with the width of the opening between blades greater than the width of the blade, one blade being offset at a greater distance from the longitudinal axis of the stem portion than the other blade, and a face at the base of the blades inclined to the opening between blades and slanting off laterally like the transverse slant of the blades. 1

2. A mixing and beating implement of the character descri'bed, comprising, a stem portion, and; at workingyportion WhiChl is tiraansversely slanted at an angle to the transverse plane of the stem portion and consisting of tWo spaced apart blades with the opening between blades at least as-w'ide as the width of the blade,one blade tudinal' axis'o-f the stem portion than the iother blade. and. a face at the base of the blades in-. clined to the opening between blades and slanting off laterally like the transverse slant of the blades. 1 Y

POLCAR. 

